Ignition Troubles - Rotors

[wolfebrian2120]

Hi All, i was wondering if any one has had experience with melted distributor rotors. I bought new coils, distributors, and rotors a few months back. All Bosch.

One of the rotors Right side seems to have melted through to the camshaft.

https://www.dropbox.com/sh/kwatvrx9z...8Tsg3susa?dl=0

Some pics to show the old one and the new one with the hole. Now the hole wasnt that big when i pulled it off. But it was all charred. I used a screw driver to remove the charred bits and that hole is the result.

Should i just replace the rotor or is it reasonable to think there is an issue with the plug wires? The plugs are fairly new. I had them replaced 30000 miles ago.

[Timm]

Burning is usually due to a poor contact with the rotor - the resistance increases the heat generated at the contact. So, I would hazard a guess that the centre contact is just not connecting properly with the rotor.

[shogun]

Sometimes the center pin in the distributor cap gets stuck or breaks, check that, http://i32.photobucket.com/albums/d3...3658c02122.jpg
plus also check the ignition coils http://www.bimmerforums.com/forum/sh...=ignition+coil

[wolfebrian2120]

The distributors are new and both look the same. the center pin is pushed out by the spring.

It must have just been a defective rotor. I cleaned up one of the old ones and put it back in. Its running fine now.
I'm gonna keep an eye on it as it took a couple months for that one to burn out.

I've just never seen a rotor burned through like that before.